Abstract
In this work we show that the generating N-photon Greenberger---Horne---Zeilinger entangled state protocol proposed by Xia et al. (Appl Phys Lett 92(1---3):021127, 2008) which can be realized by a simpler optical setup and with a higher success probability. The present protocol setup involves simple linear optical elements, N single-photon superposition states and conventional photon detectors. This makes the protocol more realizable in experiments.
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